Linker not linking external source library

Asked May 02 '18 at 00:13

Active May 02 '18 at 00:24

Viewed 16 times

So I have a project located at "C:/something/something/project.sln"

The functions I am using in this project I am wanting to use again over and over again. So I have created

"C:/folder/include.h", "C:/folder/maths/maths.h", "C:/folder/maths/maths.cpp"

Include.h:

#include #pragma once

#include "maths\maths.h"

maths.h

namespace maths
{
   int add(int a, int b);
}

maths.cpp

#include "maths.h"
namespace maths
{
  int add(int a, int b) { return a + b; }
}

function 'add' is unresolved external.

I am using VS2017. I am guessing it is to do with using the linker or additional include directories however, nothing I tried there got it to work. I suppose I could create a project in 'folder' then compile as .lib, however, I don't think that, that should be needed. Thanks :)

edited May 02 '18 at 00:24

asked May 02 '18 at 00:13

mathewcook123

You just need to add *both* .cpp files to your project, that's all. – HolyBlackCat May 02 '18 at 00:16
Did you add the library to the project, where you want to use it? – NuPagadi May 02 '18 at 00:17
2

@NuPagadi I think OP misuses the word "library". – HolyBlackCat May 02 '18 at 00:20
@NuPagadi so I do need to create a .lib file for /library? Create new lib then add source from /folder compile then include? Thanks – mathewcook123 May 02 '18 at 00:23
@HolyBlackCat you are right sorry for confusion. – mathewcook123 May 02 '18 at 00:24
That's not a *source library*. It's a source **file**. There is a major difference between them. – Ken White May 02 '18 at 00:26
No, you don't need to create a library. You could, but it'll just make things harder. As I said, you need to add `maths.cpp` to the project. – HolyBlackCat May 02 '18 at 00:26
@HolyBlackCat That you very much :) – mathewcook123 May 02 '18 at 00:29

Linker not linking external source library

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